Geotech and pavement design information
- 1. Geotechnical Information for FM78 and Lakeview 1 boring made at 15 feet below surface Approximate Consitency Description Depth of Material Encountered /Density Stratum (feet) 1 1/2 inches of Asphalt over 4 inches of - 0 to 1/2 - Crushed Limestone Base Material Fill - LEAN CLAY (CL); dark brown and brown Stratum I 1/2 to 1 Stiff mottled Stratum II 1 to 7 CLAY (CH); dark brown Stiff to Very Stiff CLAY (CH); yellowish brown and gray with Stratum III 7 to 15 Stiff to Very Stiff gypsum crystals Approximately 3 feet of clay should be removed and replaced with select fill These conditions will satisfy a Condition C Foundation *Note: Sample was taken less than 1000 feet away. This is the reason for the initial layer of asphalt in the boring sample. Subsurface Information Existing Lean Clay Clay Volumetric Changes moderate high Plasticity Index (PI) 26% 35% to 54% In-situ moisture content 3% 1% to 7% 11 blows for 12" 10 to 25 blows for SPT "N" Values penetration 12" penetration
- 2. Foundation Considerations Shallow Strip Footings Item Description Bearing Stratum Select fill Minimum embedment below final grade 24 inches below final grade Bearing pressures Net allowable total load - 2,000 psf Approximate total settlement 1 inch Estimated approximate differential settlement 1/2 to 3/4 inch Allowable passive resistance 1,000 psf per foot of depth Coefficient of sliding friction 0.4 Uplift Resistance Foundation Weight (150 pcf) & Soil Weight (120 pcf) Pavement Design Information Flexible Pavement System Material Thickness (inches) Component Parking Area Driveway Asphalt (Type D HMAC) 1.5 2 Crushed limestone base 9 10 Moisture conditioned subgrade 6 6 Parameter Asphalt Reliability (%) 70 Standard Deviation 0.45 Initial Serviceability Index 4.2 Terminal Serviceability Index 2 Design life of 10 years 2,000 ESAL per year in driveway areas 1,000 ESAL per year in parking areas
- 3. Porous Paver Information Purchased from Belgard Company, Aqua-Roc Porous Paver will be used. Material Component Thickness (in.) Vehicular Paver 3.15 #8 Aggregate 2 #57 Aggregate 6 #2 Subbase Aggregate 6 To be used in parking stalls, as well as parking lot walkways for foot trafic. This material will support the stormwater runoff design. Stormwater runoff will flow under the parking lot to a system of pipes, which will direct the water to a nearby sewer easement. This material will also give benefit to our LEED certification goals, and also meets ADA requirements
- 4. Parking Lot Pricing Asphalt Paving for Roadways, Assembly Costs On-site roadway, with 10" thick aggregate base, 2" thick asphalt binder course, rubberized asphalt interlayer, and 2" thick wear course. Craft@Hrs Unit Material Labor Equipment Total Fine grading and compact existing subbase P5@.066 SY 0.01 2.89 2.69 5.59 Stone aggregate base, Class 2, 10" thick P5@.02 SY 8.35 2.2 2.05 12.6 Binder course 2" thick (9 SY per ton) P5@.039 SY 11.3 1.71 1.59 14.6 Rubberized asphalt interlayer P5@.005 SY 1.28 0.22 0.2 1.7 Wear course 2" thick (9 SY per ton) P5@.039 SY 11.8 1.71 1.59 15.1 Tar emulsion protective seal coat P5@.034 SY 3.51 1.49 1.39 6.39 Total estimated cost for typical 10' wide roadway, 4" paving over 4" aggregate base Cost per SY of roadway P5@.203 SY 31.24 8.9 8.28 55.98 Asphalt Paving for Parking Areas, Assembly Costs A vehicular porous paver will be purchased from manufacturer Belgard and used in the parking stall areas, as well as foot traffic walkways. For our required dimensions, a purchase price estimate including base aggregates and labor was given to be roughly $7 per square foot. Cost Driveway Parking Lot 3076 SY 24937 SF 55.98 Cost/SY 7 Cost/SF 172194 Cost 174559 Cost Total Cost 346753.5
- 5. All black areas will be made up of asphalt pavement as designed in the previous pages. The grey sections, including the parking stalls and the walkways, will be made up of the aforementioned porous paver.